this is cellphone video taken by a witness soon after the plane crashed near watsonville community hospital. the ntsb is in charge of finding out what happened. investigators picked through the charred remains. >> we look at the man, the machine and the environment. when we look at the man we look at the pilot, his or her training, his or her experience or his or her experience in the air craft type. >> david houghton started flying a few years ago. he bought the muni-m-2f last year. investigators won't speculate on a cause for this crash, but houghton's friends have their own ideas. >> probably the airplane stalled and lost altitude. when you lose altitude on takeoff, there isn't any -- there isn't enough altitude to recover from a stall. >> authorities confirm david dee^dee and the boys died instantly. >> they are just an incredible family. they do so much. if you need a hug, a smile anything, the houghtons, they were the people.